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There are many pros and cons to legalising cannabis. I accept that. But the bottom line for me is this: would legalisation improve the health, well-being and productivity of New Zealand? No, it would not. How could it?

So why legalise it? Why capitulate to the cannabis crowd, just because a few other countries have? Why surrender?

Why would we want to throw even more fuel on the fire of our mental health crisis, particularly among our youth? Why add to the scrapheap of wasted lives? I have seen its insidious effects on far too many people I care about. Stolen potential. Broken lives.

But there's a broader theme unfolding here, that spells political danger for the Government. They could cook their own goose.

This narrative, this perception keeps building. Soft on crime. And dysfunction.

So this referendum on legalising dope could actually play right into the opposition's hands. It could be the tipping point, the final straw. The killer blow that seals Labour's perception problem: Soft on crime.

Is the Government playing with political fire? Time will tell. But middle New Zealand is certainly watching.

* Mike Yardley is a Newstalk ZB host and is this week presenting the Mike Hosking Breakfast show.